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Image-forming apparatus

a technology of image-forming apparatus and toner, which is applied in the field of image-forming apparatus, can solve the problems of difficult to apply biases suitable for both the first and second transfer toner images, and the amount of secondary transfer toner remains, so as to prevent the image quality from being impaired, reduce the amount of electric charge to be applied to the toner when passing the primary transfer region, and increase the particle diameter of the formerly primarily transferred toner image

Inactive Publication Date: 2007-03-15
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] With this configuration, the particle diameter of the formerly primarily transferred toner image is increased. Since toner having large particles is hard to charge, the amount of electric charge to be applied to the toner when passing the primary transfer region can be decreased. In addition, in order to prevent the image quality being impaired due to the usage of large-particle toner, the particle diameter of the light toner, of which image deterioration is less noticeable, is increased.
[0015] In this way, the difference between the amounts of electric charge of the toner images can be decreased, and toner images having the desired colors can be formed on the recording medium.

Problems solved by technology

However, with the above-described image-forming apparatus, a considerable amount of the secondary transfer toner remains at the intermediate transfer body in the secondary transfer.
Owing to this, toner images of desirable colors may not be formed on the recording medium.
If the difference between the amounts of electric charge is increased, it is difficult to apply biases suitable for both the first transferred toner image and the subsequently transferred toner image, to the secondary transfer member.

Method used

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first embodiment

[0027] An embodiment of the present invention will be described below in detail with reference to the drawings.

General Configuration of Image-Forming Apparatus

[0028] An image-forming apparatus according to the present embodiment shown in FIG. 1 is a full-color image-forming apparatus which primarily transfers a toner image formed on a photoconductor drum (image carrier) 1 onto an intermediate transfer belt (intermediate transfer body) 5, and then secondarily transfers the toner image onto a recording medium.

[0029] The image-forming apparatus according to the present embodiment includes one photoconductor drum 1 and six developing devices (developer or toner image-forming devices) 4 which develop electrostatic images formed on the photoconductor drum 1. The six developing devices 4 are filled with toners of light cyan, light magenta, dark magenta, dark cyan, yellow and black, respectively.

[0030] Accordingly, toner images of the light cyan, light magenta, dark magenta, dark cyan,...

second embodiment

[0124]FIG. 9 is a second embodiment of the present invention. The image-forming apparatus according to the present embodiment employs tandem system where image-forming units Pa to Pf each of which is provided with the photoconductor drum 1 are disposed along the intermediate transfer belt 5 which rotates in the direction of the arrow R2.

[0125] Note that like numerals will refer to like parts which have equivalent configurations and effects as that used in the image-forming apparatus according to the first embodiment, and the description thereof will be omitted. In addition, the volume mean particle diameter, density and hue of each toner are equivalent to that of the first embodiment, and the measurement of the amount of electric charge per unit mass of each toner employs the same method as that of the first embodiment.

General Configuration of Image-Forming Apparatus

[0126] In FIG. 9, toner images of the light magenta, light cyan, yellow, dark magenta, dark cyan and black are for...

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PUM

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Abstract

An image-forming apparatus includes: a first image carrier for carrying a light toner image which is formed with a light toner; a first transfer member for electrostatically transferring the light toner onto an intermediate transfer body; a second image carrier for carrying a dark toner image which is formed with a dark toner having the same hue as that of the light toner and having a density higher than that of the light toner; a second transfer member for electrostatically transferring the dark toner image onto the intermediate transfer body; and a secondary transfer member for transferring the dark toner image and the light toner image electrostatically onto a recording medium together, in which the light toner has a volume mean particle diameter greater than that of the dark toner.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an image-forming apparatus which primarily transfers a toner image from an image carrier onto an intermediate transfer body, and then secondarily transfers the toner image onto a recording medium, by using toners having the same hue and having different color densities, such as a dark magenta toner and a light magenta toner, or the like. [0003] 2. Description of the Related Art [0004] In recent years, an electrophotographic type image-forming apparatus has used toners having the same hue and having the different color densities, such as dark magenta toner and light magenta toner, or the like, for extending a color-reproduction range. [0005] A dark magenta toner image-forming unit and a light magenta toner image-forming unit are provided in this type of image-forming apparatus, so that a dark magenta toner image and a light magenta toner image are formed. [0006] In the image-forming u...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03G15/01
CPCG03G2215/0602G03G15/1605
Inventor MURAYAMA, TATSUOMITOYOHARA, YUICHIRO
Owner CANON KK
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